Article directory 1. Hash table 2. The underlying implementation of Go map hmap bmap mapextra with overflow bucket 3. Expansion rules Double the capacity Equivalent expansion 4. Other features map traverses unordered map is not thread safe 1. Hash table The hash table is used to store key-value pairs, and the key-value pairs are hashed […]
Tag: map
echarts map display specified area
How to obtain the specified area: City range selector: http://datav.aliyun.com/portal/school/atlas/area_selector The echarts map displays the specified area and the latitude and longitude settings to display the label, demo: <!DOCTYPE html> <html> <head> <meta charset=”utf-8″> <title>Map of Hefei</title> <style> *{ margin: 0; padding: 0;} body{ background: linear-gradient(45deg , #001B4B , #006FCA , #006FCA , #003783);} </style> […]
SQL optimization 21 combo + mind map
Click on “Yao Dao Source Code” above and select “Set as Star” Does she care about the front wave or the back wave? A wave that can wave is a good wave! Update articles every day at 10:33, lose a million bits of hair every day… Source code boutique column Original | Java 2021 Super […]
List, Set, ConcurrentHasMap of java concurrent programming
List, Set, ConcurrentHasMap of java concurrent programming 1, ArrayList Features: fast query speed, automatic expansion, elements are placed in order, and elements can be repeated Storage structure: array Expansion principle and expansion size ArrayList will be expanded to 1.5 times the original capacity When ArrayList calls the add() method, it will judge whether it needs […]
Talking about the underlying expansion mechanism of HashSet and HashMap
Article directory foreword 1. A brief introduction to the underlying implementation of HashSet 2. What is the expansion mechanism of HashTable? 3. Experiment of array expansion 1. Before the experiment, you must first set up IDEA 2. Add the first piece of data 3. Experiment of linked list expansion step 1 step 2 4. Supplementary […]
Analysis of the underlying principle of HashMap
Table of Contents 1. Introduction to HashMap 1.1 Features 1.2 Underlying implementation 2. structure and corresponding method analysis 2.1.2.1 Linked list Node class 2.2 Method implementation 2.2.1 Array initialization of HashMap 2.2.2 Calculate the hash value 2.2.3 Add element put (K key, V value) method 2.2.4 Array expansion 3. Summary 1. Introduction to HashMap 1.1 […]
STM32 port multiplexing (mapping) & interrupt
STM32 port multiplexing (mapping) & amp; interrupt Article directory STM32 port multiplexing (mapping) & amp; interrupt 1 Port multiplexing and remapping 1.1 What is port multiplexing and remapping 1.2 Enable port multiplexing 1.3 Port multiplexing 1.4 Summary: Two, interruption 2.1 Concept of Interrupt Priority Management 2.2 Code part 2.2.1 Set group 2.2.2 Setting Preemption and […]
Communication between unix/linux processes——semaphore
Introduction to semaphores A semaphore is a counter used for synchronization between processes and threads, and for access to critical resources. A critical resource can be a piece of code or a parameter, etc. If the semaphore value is greater than or equal to 0, it means that the process can access the critical resource, […]
Hash and BloomFilter, bitmap
Produced by Zero Sound Academy Teacher Mark QQ: 2548898954 Hash and BloomFilter, bitmap background need balanced binary tree hash table hash function select the hash load factor conflict handling bloom filter background constitute principle Application Scenario Application Analysis variable relationship determine n and p Choose a hash function Distributed consistency hash background Application Scenario hash […]
Map interface (key, value)
Introduction The Javaa collection framework provides a Map interface specially used to handle the storage of key-value mapping data. Multiple elements can be stored in a Map, and each element is composed of two or two objects, that is, a key (key) object and a value (value) object, and the corresponding value can be mapped […]